The NASA GRACE & GRACE-FO Data Analysis Tool allows comparisons and analysis of GRACE & GRACE-FO data over land and oceans. The tool allows visualization of spatial fields, as well as subsetting and basin averaging for the world's large river basin. Full datasets can be downloaded through the database for further analysis.
This interface provides interactive access to the JPL-Mascon fields. Each individual mascon pixel can be visualized & evaluated (e.g., to assess trends and seasonal amplitudes).